Asked by Algebra

Can someone check my work please?
Fine the sum of the arithmetic series -4 + 1 + 6 + 11 + ..... + 91.

I know that a1= -4, d=5, and a20=91.

S20= 20/2 (-4 + 91)
S20= 10 (87)
S20= 870
The sum of the arithmetic series is 870.

Answered by Bosnian
Your work is completely correct.
Answered by Algebra
Yay!! Thank you so much for checking. Have a lovely day.
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